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Array signal processing with non-ideal uniform circular arrays in correlated signal environments

The Davies transformation is a method to transform the steering vector of a uniform circular array (UCA) to one with Vandermonde form. As such, it allows techniques such as spatial smoothing for direction of arrival (DOA) estimation in a correlated signal environment, developed originally for uniform linear arrays, to be applied to UCAs. However, the Davies transformation can be highly sensitive t

Experiences from the Architectural Change Process

A good software architecture is becoming recognized as a major factor for successful products. There has been much research on the technical aspects of software architecture and it is recognized that the driving requirements for architectures are "non-functional", but few have studied how organizations decide on architectural changes. In this paper we study the topic through several case studies.